Perhaps you should try some spelling variations:
chieu sach » chiet tach, chieu sang, chieu xanh
chung cong » nhung cong, chong cong, phung cong
phong cac » phong cach, thong cac, phong cai
cac chung » cac phuong, cac cong
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) OR (chinh sach)) - khanh phong cac chung cong tam toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) OR (chinh sach)) - khanh phong cac chung cong tam toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) OR (chinh sach)) - khanh phong cac chung cong tam toan cau*.